AI Article Synopsis
- The study investigates how root exudates from different plants affect the biodegradation of 6:2 Fluorotelomer alcohol (FTOH), a type of PFAS, in the environment.
- Both dicot (Arabidopsis thaliana) and monocot (Brachypodium distachyon) exudates boost the breakdown of 6:2 FTOH when combined with a specific bacteria, Rhodococcus jostii RHA1.
- The findings suggest that enhancing root exudates and using bioaugmentation can improve the removal of PFAS contaminants from soil, indicating potential strategies for soil remediation.
Article Abstract
6:2 Fluorotelomer alcohol (FTOH), one of per- and polyfluoroalkyl substances (PFAS), is widely used as a raw material in synthesizing surfactants and fluorinated polymers. However, little is known about the role of root exudates on 6:2 FTOH biodegradation in the rhizosphere. This study examined the effects of root exudates produced from dicot (Arabidopsis thaliana) and monocot (Brachypodium distachyon) grown under different nutrient conditions (nutrient-rich, sulfur-free, and potassium-free) on 6:2 FTOH biotransformation with or without bioaugmentating agent Rhodococcus jostii RHA1. All the exudates enhanced defluorination of 6:2 FTOH by glucose-grown RHA1. Amendment of dicot or monocot root exudates, regardless of the plant growth conditions, also enhanced 6:2 FTOH biotransformation in soil microcosms. Interestingly, high levels of humic-like substances in the root exudates are linked to high extents of 6:2 FTOH defluorination. Bioaugmenting strain RHA1 along with root exudates facilitated 6:2 FTOH transformation with a production of more diverse metabolites. Microbial community analysis revealed that Rhodococcus was predominant in all strain RHA1 spiked treatments. Different root exudates changed the soil microbiome dynamics. This study provided new insight into 6:2 FTOH biotransformation with different root exudates, suggesting that root exudates amendment and bioaugmentation are promising approaches to promote rhizoremediation for PFAS-contaminated soil.
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| http://dx.doi.org/10.1016/j.jhazmat.2024.133651 | DOI Listing |
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